• Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU

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#1 Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by yasiu83 27 July 2023, 11:43
Cześć. Płyta trafiła do mnie z uszkodzonym BIOS-em. Po zaprogramowaniu uruchomiła się tylko raz. Kolejne programowanie i pamięć nie przechodziła weryfikacji, wymieniłem na taką samą MXIC MX MX25U12835F, po zaprogramowaniu świeci tylko dioda CPU. Sprawdzane na Ryzen 3 1200 i Ryzen 5 3600, wgrywałem różne BIOS-y ale zauważyłem, że na cewce CHOKE13 nie ma napięcia, nie ma sygnału enable na przetwornicy U41 rt8125egqw. Skąd bierze się ten sygnał? Reszta napięć jest na płycie, nie zauważyłem zwarć, na mostku 21,5Ω do masy. Proszę o pomoc w naprawie.

Re: Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by Google Adsense [BOT] 27 July 2023, 11:43

#2 Re: Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by matic 27 July 2023, 12:06
Hello!

Measure the voltages to ground on all pins of transistor Q77.

#3 Re: Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by yasiu83 27 July 2023, 12:36
G1 - 5V
D2 - 0V
S2 - 0V
G2 - 3.3V
D1 - 0V

#4 Re: Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by matic 27 July 2023, 15:37
Measure the voltages to ground on all pins of transistors Q89 and Q92.

#5 Re: Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by yasiu83 27 July 2023, 16:28
Q89 tylko na D2 - 3.4V, reszta 0V.
Q92 - G1,G2- 5V, reszta 0V.

#6 Re: Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by matic 28 July 2023, 12:18
Measure the voltages to ground on pin 2 of resistors R401, R443.

#7 Re: Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by yasiu83 28 July 2023, 13:45
R401 - 3.12V
R443 - 0V

@Matic spróbowałem jeszcze raz zaprogramować BIOS do najnowszej wersji. Płyta się uruchomiła, wyłączałem i włączałem kilka razy i wszystko było ok. Zostawiłem wyłączoną na jakiś czas i sytuacja się powtórzyła. Podejrzewam jakieś problemy z połączeniem gniazda procesora z płytą albo jakieś pęknięcie połączeń laminatu.

#8 Re: Płyta MSI B450M PRO-VDH MS-7A38 ver 4.0 świeci dioda CPU


by matic 6 August 2023, 12:48
Try to little bend the board from different sides while the board is turned on and check if this has any effect.

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